#include <stdio.h>                                
                                                  
extern int compress_file (const char *filename); 
                                                  
int main (int argc, char *argv[])                
{                                                
  if (argc < 2)                                   
    {                                             
      printf ("usage : %s file\n", argv[0]);      
      return 1;                                   
    }                                             
  return compress_file (argv[1]);                 
}
                                                